Book/Dissertation / PhD Thesis

FZJ-2021-02379

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Surface plasmon-enhanced molecular switching for optoelectronic applications

Lenyk, B. (Corresponding author)FZJ*

2021
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich Jülich
ISBN: 978-3-95806-595-6

Please use a persistent id in citations: http://hdl.handle.net/2128/30530  urn:nbn:de:0001-2022020816

Abstract: Molecular electronics aims at gaining control over the operation of macroscopic devicesby employing molecules as building blocks. To fulfill the spectrum of functions, varioustypes of molecules are designed including photochromic molecules. Diarylethenes are anexample of the latter one and are discussed as potential optoelectronic switches, which canreversibly transition between two forms with different electrical conductance and opticalabsorbance. By exposure to UV light, the overall electronic structure alters from nonconjugation(open) to end-to-end conjugation (closed) forms, while visible light reversesthe process.These features enable to intensively employ diarylethenes in a single-molecule junctionupscaling their usage to large-area ensemble contacts. However, in general, the transitionbetween closed and open states (opening) exhibits a lower quantum yield compared tothe reverse UV-activated process of closing. These unequal switching rates can be problematicfor optoelectronic molecular contacts relying on reversible switching. Thereby, inthis work, the novel strategy is proposed to use surface plasmon-enhanced electromagneticfields to accelerate the visible-light-mediated cycloreversion reaction. To implementthis concept into large-area molecular contacts with vertical geometry, a plasmonic fieldenhancement of gold films perforated with nanoholes was employed.The surface plasmon resonance properties of nanohole arrays fabricated by nanospherelithography are systematically studied as a function of the geometrical features such aslattice constant, thickness, and hole diameter. Moreover, nanohole arrays are testedin different media, e.g. aqueous solution, revealing a novel phenomenon of enhancedtransmission in the visible range, which can be applied not only for enhancing visible-lighttriggeredchemical reactions but for other applications like biosensing, live-cell imaging,etc.

Note: Dissertation, Universität zu Konstanz, 2021

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Contributing Institute(s):

1. Bioelektronik (IBI-3)

Research Program(s):

1. 524 - Molecular and Cellular Information Processing (POF4-524) (POF4-524)

Appears in the scientific report 2021

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Database coverage:
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